Super Stretchable and Compressible Hydrogels Inspired by Hook-and-Loop Fasteners
Super Stretchable and Compressible Hydrogels Inspired by Hook-and-Loop Fasteners
复制标题
DOI：
10.1021/acs.langmuir.1c00924
复制
发表时间：
2021-06-15
期刊：
影响因子：
3.9
通讯作者：
Sun, Luyi
中科院分区：
文献类型：
--
作者：
Ding, Fuchuan;Ding, Hao;Sun, Luyi
受到钩环紧固件的启发，我们设计了一种含有α-磷酸锆（ZrP）二维纳米片的水凝胶网络，该纳米片具有高密度的表面羟基，充当具有众多“钩”的纳米片，而具有丰富胺官能团的聚合物链充当“环”。“我们的多尺度分子模拟证实，纳米片上的高密度羟基和聚合物链上的大量胺官能团对于在分子尺度上实现可逆相互作用至关重要，它们可以作为纳米钩环紧固件来耗散能量。结果，合成的水凝胶具有上级的拉伸性（>2100%应变）、压缩回弹性（>90%应变）和耐久性。值得注意的是，该水凝胶可以在模拟滑液的溶液中承受>5000次压缩和扭转循环，因此有希望用于潜在的生物医学应用，例如人工关节软骨。这种钩环模型可以被采用和推广，以设计各种具有特殊机械性能的多功能材料。
Inspired by hook-and-loop fasteners, we designed a hydrogel network containing a-zirconium phosphate (ZrP) two-dimensional nanosheets with a high density of surface hydroxyl groups serving as nanopatches with numerous "hooks," while polymer chains with plentiful amine functional groups serve as "loops." Our multiscale molecular simulations confirm that both the high density of hydroxyl groups on nanosheets and the large number of amine functional groups on polymer chains are essential to achieve reversible interactions at the molecular scale, functioning as nano hook-and-loop fasteners to dissipate energy. As a result, the synthesized hydrogel possesses superior stretchability (>2100% strain), resilience to compression (>90% strain), and durability. Remarkably, the hydrogel can sustain >5000 cycles of compression with torsion in a solution mimicking synovial fluid, thus promising for potential biomedical applications such as artificial articular cartilage. This hook-and-loop model can be adopted and generalized to design a wide range of multifunctional materials with exceptional mechanical properties.